Select a mounting option
Recommended for all installations
Enables simplest adjustment.
Offers highest accuracy.
Enables eccentricity to be com pen sat ed.
Offers excellent mechanical stability against
thermal cycling, shock and vibration.
Minimises cost of substrate prep a ra tion.
Notes
Taper mount
Interference fi t
‘B’
section
Not
applicable
Alternative installation
Will not correct eccentricity of
the supporting shaft.
‘A’
section
Step 2
Taper mount method
DTI
NOTE:
At this stage, the screws
should only be lightly tightened
(approximately 0.5 Nm) to allow
further fi nal adjustment.
Clean shaft taper and internal taper of RESR
as recommended in the storage and handling
section.
Use 4 equally spaced M3 screws
(on RESR sizes 52 mm to 150 mm use
3 screws).
NOTE:
Do not lubricate screws.
Insert the screws so that the RESR is loosely
connected to the shaft, then roughly align the
ring by eye and touch.
Lightly tighten the screws. Use a Dial Test
Indicator (DTI) to check the radial displace-
ment at the screw locations.
NOTE:
Disregard the radial displacement
between the screw locations.
Adjust the screws so the radial displacement is the same at each screw location.
When adjusting, identify the screw location with the lowest radial displacement and tighten that
screw, aiming for the average of the highest and lowest indicator readings.
Repeat this process until the DTI readings are within ±15 µm at the screw locations.
Use a DTI with low exertion force to avoid
scratching the scale surface. A DTI with a
ruby ball stylus is recommended as a further
precaution against scratches.
Rec om mend ed surface fi nish
Ra value is 1.2 µm or better
DO
(mm)
DO
(mm)
DT
(mm)
238.85
238.65
283.85
283.65
333.85
333.65
395.85
395.65
383.85
383.65
513.85
513.65
255
300
350
413
417
550
DO
(mm)
DT
(mm)
33.85
33.65
40.85
40.65
58.85
58.65
83.85
83.65
83.85
83.65
83.85
83.65
52
57
75
100
103
104
DT
(mm)
98.85
98.65
133.85
133.65
183.85
183.65
189.85
189.65
189.85
189.65
212.85
212.65
115
150
200
206
209
229
DO = Nominal external diameter
Roundness value
(mm TIR)
Diameter
(mm)
115
150 to 255
300
0.025
0.050
0.075
Recommended taper roundness
Recommended taper diameter (DT)
Taper mount method
Step 1
DT
15° ± 0.2°
7 min
0.5*
Mounting shaft specifi cations
*For 417 mm and 550 mm rings only, 1.0